One vertex per element, one color per generator, with an edge from x to x·s.
(1,2,4,5)(3,7,8,6)(10,14)(12,16)(17,18)(19,20)(21,22)(23,24)(27,33)(28,35)(30,36)(31,38)(2,5)(3,8)(9,10,13,14)(11,12,15,16)(18,22)(19,24)(27,33)(30,36)(34,39)(37,40)(3,8)(6,7)(10,14)(11,15)(17,19,21,24)(18,23,22,20)(25,26,29,32)(27,30,33,36)(28,31,35,38)(34,37,39,40)(1,3)(2,6)(4,8)(5,7)(9,11)(10,12)(13,15)(14,16)(17,20,21,23)(18,24,22,19)(25,27)(26,30)(28,34)(29,33)(31,37)(32,36)(35,39)(38,40)(1,2)(3,6)(4,5)(7,8)(9,12)(10,11)(13,16)(14,15)(17,18)(19,23)(20,24)(21,22)(25,28)(26,31)(27,34)(29,35)(30,37)(32,38)(33,39)(36,40) involution — undirectedA Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.